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Where is the fuse for the trailer lights circuit

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The trailer lights operate off the same circuits as your regular
truck lights, if you have problems, check your trailer plug and ground. A simple test light should do the job for you.

Posted on Aug 04, 2008

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Have no power for running lights at trailer plug


The T PARK fuse in the rear fuse-relay block supplies battery positive voltage to a separate park lamp circuit connected to the trailer wiring harness..
For trailer wiring, separate turn signal circuits are connected through the GMSF to the trailer wiring harness.
Fuse Block - Rear
Beneath the left rear seat
Trailer TR/PARK fuse 42 10amp

Apr 14, 2016 | 2007 GMC Envoy Denali

1 Answer

Where is the trailer light fuse control on a 2007 Ford Expedition


As trailer lights are run off the existing wiring of the vehicle then those vehicle fuses control the wires and circuits for the trailer. If you have a problem with trailer lights then check the wires and connections in the trailer plugs.

Aug 10, 2014 | 2007 Ford Expedition EL XLT

1 Answer

Where is the trailer light fuse


The answer to this question depends on several factors such as: Whether the towbar was a factory fitted unit fitted during
pre-delivery, a genuine brand unit or an aftermarket unit & who, where & when it was fitted...
The majority of towbars & the assosiated wiring out there are simply wired in to the rear tail light circuits such as:
  • Trailer stop lights wired to vehicle stop light circuit in eighther of the rear tail lights.
  • Trailer park lights wired to vehicle park light circuit same side as the stop lights, as above.
  • Trailer number plate lights wired to vehicle park light circuit same side, as above.
  • Trailer reverse lights (if fitted) wired to vehicle reverse light circuit same side, as above.
  • Trailer left hand indicator wired to vehicle left hand indicator light circuit
  • Trailer right hand indicator wired to vehicle right hand indicator light circuit.
This means that if fitted in this manner (as the majority are) the corrosponding vehicle light fuse will affect the trailer lights unless the is an inline fuse fitted to each single circuit (which cld be blown). This is very uncommon & wld be a costly way to do it...

In some more modern cars that came from the factory (not the dealership ie. pre-delivery) with the tow bar fitted as standard equipment it is possible that there cld be a sepparate little fuse box or section in the main fuse box (the position of the fuse box/es shld be in your owners manual usually Under the bonnet, under the dash or behind font foot kick panels, & if you dont have an owners manual for your vehicle they are usually available to buy an aftermarket version or these days on the internet & often downloadable for free or @ a small charge).

All the best & I hope this is of some help...


Referances: Me, I am an auto mechanic.

Jul 01, 2014 | 2006 Jeep Grand Cherokee

1 Answer

I have a 2003 ford F150 and I bought a factory plug in trailer harnes but the only light that work now is the running light I got back under truck and tried the harnes with a tester and it seem the trailer...


The fuses for the trailer tow adapter are in the normal fuse panels.

Engine Compartment fuse panel
101 - Is the battery charge circuit ( hot in run position )
20 - Left Stop / Turn fuse
19 - Right Stop / Turn
5 - Trailer tow reversing lamps & Trailer Tow parking lamps

Cab Fuse Panel
23 - fuse for the relay for the trailer tow battery charge circuit

All of these are in the owners manual

If you did not get an owners manual with your truck ( purchased used ), you can download one from Ford :
https://www.fleet.ford.com/maintenance/owners_manuals/default.asp

Oct 04, 2010 | 2005 Ford F-150

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I have a 2002 E 150 with the trailer light system already installed. The van lights all work but only the right trailer turn indicator light does not work. I have checked the problems thru the system and...


The trailer lights on your van should be fused independently of the vehicle lights if you have the factory wiring. There is a fuse junction block under the hood [should be in the left corner somewhere] and in that you should find the fuses for the trailer lights and other functions. This is from memory but check fuses #5 and #6, [10 amps fuses] and see if they are blown. I could be wrong on the numbers so you might have to check them all. Usually its the trailer that causes these fuses to blow so if you find a blown fuse replace it and make sure it doesn't blow again by testing all the lights with the trailer unhooked. If that's ok then hook up the trailer and check again. If it blows with the trailer hooked up then you probably have a short circuit in the trailer wiring somewhere. Good luck, hope this helps!

Jul 21, 2010 | 2002 Ford Econoline Cutaway

2 Answers

Running trailer lights not working, but brake


Did you check the fuse for the trailer tow adapter paring lamps ? This is a separate fuse powered by a relay, it is not the same circuit as the truck's parking lamps.
This is fuse # F10 & The half size ISO relay, R201 in the fuse panel in the passenger side kick panel.
This is based upon being a new body style 2004, not the 2004 Heritage or Lightning models, those are different fuse & relay locations.

Jun 05, 2010 | 2004 Ford F150

2 Answers

Need fuse list for 2001 ford f350 trailer lights not working


In the fuse box under the hood, fuse in position 20 is a 7.5amp fuse for the trailer left turn circuit, fuse in position 22 is a 7.5 amp fuse for the right turn circuit, if the fuses are good and you have power at them it is going to be wiring, at the back of the truck close to the driver side at the bumper is a gray connector that will take factory wiring to you trailer wiring the yellow wire is left turn/brake light, the green wire is right turn/brake light, and the brown is tail lights, and the orange wire is 12volt feed for if there is a battery on the trailer that needs to be kept charged for break away safty brakes.

Sep 18, 2009 | 2001 Ford F350 Super Duty SuperCab

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